Snape comes back, but then dies.
No.
They don't actually get back together in deathly hallows but we know they do because in the epilogue they are married.
Yes, but he eventually comes back.
yes harry potter goes back to Hogwarts
Harry, along with Hermione and Ron, did not go back to Hogwarts and, instead, went on a hunt for the remaining horcruxes that Voldemort created. At one point, Harry wanted to search more for the Deathly Hallows, but Hermione stopped him from delving in too deeply into the topic, as they were trying to complete the mission Dumbledore gave them before his murder by Severus Snape.
No, Voldemort is killed at the end of the book.
Yes.
In Harry Potter And The Deathly Hallows Harry gos back to Hogwarts in the 29th chapter.
yes he does, but he does not in the Deathly Hallows
No.
This a very interesting question but I think that you mean the spine of the book, not the back. The symbol on the spine means a little bit about the story. For example, the symbol on the spine in The Deathly Hallows shows the symbol of the Deathly Hallows.
She didn't have it back . She got Bellatrix Lestrange's wand instead.